Or do you not know that your body is a temple of the Holy Spirit within you, whom you have from God? You are not your own, for you were bought with a price. So glorify God in your body.
1 Corinthians 6:19-20

Caring for the body and bringing it into submission to Torah are spiritual exercises with eternal consequences. Failure to care for the body, and failure to bring it into submission also have eternal consequences.